Question

How much energy consume by a heater of power 200W in time in 20 min.

Answer 1

Answer:

E=P×T

P=.2kwh

T=20/60=2/6=1/3=.33

E=P×T

.2×.33 =.066

Answer 2

Solution:

Given:

=> Power = 200 W

=> Time = 20 min

              = 20 × 60 sec.

              = 1200 sec.

To Find:

=> Energy.

Formula used:

=> Energy = Power × Time.

So,

Energy = Power × Time.

=> 200 × 1200

=> 240000 Joules.

=> 240 Kilo Joules.

So, the energy consumed by the heater is 240 kilo Joules.

Extra Info:

What is energy?

• Energy is the ability of a physical system to produce changes on other physical systems.

Or

• Energy is the ability to work.

• The S.I. unit of energy is joules (J).

What is power?

• Work done per unit time is called power.
• Its S.I. unit is watt, denoted by (W).